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M01. J. D. CARTER. DIAPHRAGM TO BE USED IN STENCIL PRINTING.

No. 405,198. Patented June 11, 1889.

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dilw'ney UNITED STATES PATENT ()rrlen.

MOION JAMES D. CARTER, OF NEW YQRK, N. Y., ASSIGNOR TO AUGUSTUS D.KLABER, OF SAME PLACE.

DIAPHRAGM TO BE USED IN STENClL-PFiINTlNG.

SPECIFICATIUN forming part of Letters Patent No. 405,198, dated June 11,1889.

Application filed January 6 1888. Serial No. 260,006. (No model.)

To all whom it may concern.-

Be it known that I, MCION JAMES D. CARTER, a subject of the Crown ofGreat Britain and Ireland, residing at 306 East One hundred andtwenty-fifth street, New York, in the county and State of New York, haveinvented a ne w and useful Improvement in Diaphragms to be Used inStencil-Printing, of which the following is a specification. 4

The object of my invention is to supply a diaphragm D, that will protectthe stencil while printing and prolong its life, that will allow the inkto go through the perforated parts of the stencil and prevent the inkfrom going through at the margins.

In printing from ordinary paper stencils the edges of the paper on Whichthe impressions are taken will in time crack the stencilS by beingconstantly pressed again st'same by the inking-roller in the act ofprinting. The ink will then force its way through this crack onto themargin of the copies. The number of clear copies is thus limited.

In the accompanying drawings, Figure 1 is a view of a sheet having acoating on all sides extending to the edges of the sheet. Fig. 2 is aView of a sheet havinga coating on all sides not extending to the edgesof the sheet. Fig. 3 is a side view of the combined printingsteneil anddiaphragm.

In printing from type-written stencils the same objection is found. Itis necessary to fold the stencil-sheet so that it goes into the carriageof certain type-writers; also at times folded top and bottom overa roughor smooth surface. The folding of the sensitive waxed paper breaks thesurface of same, and in printing the ink will very soon force its waythrough this cracleonto the margin of the copies.

The invention consists in providing a perous diaphragm with a waxed edgeor an inkproofed edge to one side of the center, at one, two, three, orfour sides of the center, at the edge of the sheet, or between the edgeof the sheet and the center, as may be found desirable.

In carrying my invention into use the diaphragm D may be stretchedpermanently in a suitable printing-frame and the stencil S subsequentlyplaced under same. The suction of the ink will keep the stencil Sin itsplace; or

it may be more permanently fixed by means of a suitable frame or withmucilage.

In printing, the diaphragm D receives the friction of the roller, andconsequently allthe wear and tear. The waxed edges A of diaphragm Dprevent the ink from getting onto the margins of the copies, the centerof the diaphragm D allowing the ink to go through the perforations ofthe stencil S; or,when using cheap paper diaphragms D, the same may bestretched, together with stencil, in any suitable printing-frame. Theedges of the diaphragm D will protect the margins of stencil, the porouspaper allowing the ink to permeate the perforations of stencil.

I claim The combination, with a printing-stencil, of a porous diaphragmhaving a portion thereof coated with an impermeable substance,substantially as described, and for the purposes set forth.

Signed at New York, in the county and State of New York, this 20th dayof December, A. D. 1887. e

MOION JAMES D. CARTER.

IVitnesses:

O. HY. JEUANE, SIDNEY HENRY.

